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AM26LV32INSRG4 Arkusz danych(PDF) 7 Page - Texas Instruments

Numer części AM26LV32INSRG4
Szczegółowy opis  LOW-VOLTAGE HIGH-SPEED QUADRUPLE DIFFERENTIAL LINE RECEIVER
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AM26LV32INSRG4 Arkusz danych(HTML) 7 Page - Texas Instruments

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AM26LV32C, AM26LV32I
LOW VOLTAGE HIGHSPEED QUADRUPLE DIFFERENTIAL LINE RECEIVER
SLLS202E − MAY 1995 − REVISED JUNE 2005
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
fail-safe conditions
The AM26LV32 quadruple differential line receiver is designed to function properly when appropriately
connected to active drivers. Applications do not always have ideal situations where all bits are being used, the
receiver inputs are never left floating, and fault conditions don’t exist. In actuality, most applications have the
capability to either place the drivers in a high-impedance mode or power down the drivers altogether, and cables
may be purposely (or inadvertently) disconnected, both of which lead to floating receiver inputs. Furthermore,
even though measures are taken to avoid fault conditions like a short between the differential signals, this does
occur. The AM26LV32 has an internal fail-safe circuitry which prevents the device from putting an unknown
voltage signal at the receiver outputs. In the following three cases, a high-state is produced at the respective
output:
1. Open fail-safe − Unused input pins are left open. Do not tie unused pins to ground or any other
voltage. Internal circuitry places the output in the high state.
2. 100-ohm terminated fail-safe − Disconnected cables, drivers in high-impedance state, or
powered-down drivers will not cause the AM26LV32 to malfunction. The outputs will remain in
a high state under these conditions. When the drivers are either turned-off or placed into the
high-impedance state, the receiver input may still be able to pick up noise due to the cable acting
as an antenna. To avoid having a large differential voltage being generated, the use of
twisted-pair cable will induce the noise as a common-mode signal and will be rejected.
3. Shorted fail-safe − Fault conditions that short the differential input pairs together will not cause
incorrect data at the outputs. A differential voltage (VID) of 0 V will force a high state at the
outputs. Shorted fail-safe, however, is not supported across the recommended common-mode
input voltage (VIC) range. An unwanted state can be induced to all outputs when an input is
shorted and is biased with a voltage between −0.3 V and 5.5 V. The shorted fail-safe circuitry
will function properly when an input is shorted, but with no external common-mode voltage
applied.
fail-safe precautions
The internal fail-safe circuitry was designed such that the input common-mode (VIC) and differential
(VID)voltages must be observed. In order to ensure the outputs of unused or inactive receivers remain in a high
state when the inputs are open-circuited, shorted, or terminated, extra precaution must be taken on the active
signal. In applications where the drivers are placed in a high-impedance mode or are powered-down, it is
recommended that for 1, 2, or 3 active receiver inputs, the low-level input voltage (VIL) should be greater than
0.4 V. As in all data transmission applications, it is necessary to provide a return ground path between the two
remote grounds (driver and receiver ground references) to avoid ground differences. Table 1 and Figures 4
through 7 are examples of active input voltages with their respective waveforms and the effect each have on
unused or inactive outputs. Note that the active receivers behave as expected, regardless of the input levels.


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